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    <title>dc.js - Adjustable Threshold Example</title>
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  <p>This example demonstrates assigning a threshold dynamically to a pie chart by creating a new dimension based on slider input.</p>
    <div id="inputSlider">
        <div><input type="range" id="slideRange" value="0.5" min="0" max="1.0" step="0.1" onchange="updateSlider(this.value)"></div>
        Score threshold: <span id="sliderValue">0.5</label>
    </div>
    <div id="dc-coreAcc-piechart"></div>
    <div id="dc-score-barchart"></div>

    <script type="text/javascript">
    var data = [
                { "book": "A", "scores": 45 },
                { "book": "B", "scores": 34 },
                { "book": "C", "scores": 54 },
                { "book": "D", "scores": 27 },
                { "book": "E", "scores": 70 },
                { "book": "F", "scores": 25 },
                { "book": "G", "scores": 92 },
                { "book": "H", "scores": 22 },
                { "book": "I", "scores": 40 },
                { "book": "J", "scores": 10 },
                { "book": "K", "scores": 40 }
               ];

    //## Create Chart Objects
    var scoreChart = new dc.BarChart("#dc-score-barchart")
                        .xAxisLabel('book_id')
                        .yAxisLabel('score');
    var goodYesNoPieChart = new dc.PieChart('#dc-coreAcc-piechart');

    //### Create Crossfilter Dimensions and Groups
    var ndx = crossfilter(data);
    var all = ndx.groupAll();
    var bookDimension = ndx.dimension(function (d) {return d.book;}),
        bookscoresGroup = bookDimension.group().reduceSum(function(d) {return d.scores;});

    //## score bar chart
    scoreChart.width(320)
        .height(320)
        .dimension(bookDimension)
        .group(bookscoresGroup)
        .elasticY(true)
        .x(d3.scaleBand())
        .xUnits(dc.units.ordinal)
        .colors(["orange"])
        .yAxis().ticks(5);

    //## pie chart
    // reusable function to create threshold dimension
    function coreCount_from_threshold() {
        var scoreThreshold=document.getElementById('slideRange').value;
        scoreThreshold=parseFloat(scoreThreshold);
        if (isNaN(scoreThreshold)) {
            scoreThreshold=0.5
        }
        return ndx.dimension(function (d) {
            var maxNumber=80;
            if (d.scores >maxNumber*scoreThreshold) {
                return 'High';
            } else {
                return 'Low';
            }
        });
    }
    var coreCount = coreCount_from_threshold();
    var coreCountGroup = coreCount.group();

    goodYesNoPieChart
        .width(320)
        .height(320)
        .radius(120)
        .innerRadius(40)
        .dimension(coreCount)
        .title(function(d){return d.value;})
        .group(coreCountGroup)
        .label(function (d) {
            if (goodYesNoPieChart.hasFilter() && !goodYesNoPieChart.hasFilter(d.key)) {
                return d.key + '(0%)';
            }
            var label = d.key;
            if (all.value()) {
                label += '(' + Math.floor(d.value / all.value() * 100) + '%)';
            }
            return label;
        })

    dc.renderAll();

    //## change slider score value to re-assign the data in pie chart
    function updateSlider(slideValue) {
        var sliderDiv = document.getElementById("sliderValue");
        sliderDiv.innerHTML = slideValue;
        coreCount.dispose();
        coreCount = coreCount_from_threshold();
        coreCountGroup = coreCount.group();
        goodYesNoPieChart
            .dimension(coreCount)
            .group(coreCountGroup);
        dc.redrawAll();
    }

    </script>
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